trunk/src/geomath.c

/*
 * Copyright (C) 2008 Till Harbaum <till@harbaum.org>.
 *
 * This file is part of GPXView.
 *
 * GPXView is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GPXView is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GPXView.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "gpxview.h"
#include <math.h>

#if defined(USE_MAEMO) && (MAEMO_VERSION_MAJOR >= 5)
#include <hildon/hildon-entry.h>
#endif

#define STR_NAN  "----"

typedef struct {
  appdata_t *appdata;

  GtkWidget *lon1, *lat1, *dist1, *dir1;
  GtkWidget *lon2, *lat2;

  GtkWidget *distance, *proj_lat, *proj_lon;
  GtkWidget *middle_lat, *middle_lon;
} math_dialog_state_t;

static gboolean mark(GtkWidget *widget, gboolean valid) {
  gtk_widget_set_state(widget, valid?GTK_STATE_NORMAL:TAG_STATE);
  return valid;
}

/* a entry that is colored red when being "active" */
static GtkWidget *gtk_red_entry_new(void) {
  GdkColor color;
  GtkWidget *widget = entry_new();
  gdk_color_parse("#ff0000", &color);
  gtk_widget_modify_text(widget, TAG_STATE, &color);
  return widget;
}

/* a label that is colored red when being "active" */
static GtkWidget *gtk_red_label_new(char *str) {
  GdkColor color;
  GtkWidget *widget = left_label_new(str);
  gdk_color_parse("#ff0000", &color);
  gtk_widget_modify_fg(widget, TAG_STATE, &color);
  return widget;
}

static GtkWidget *gtk_dir_entry_new(float val) {
  char str[16];
  GtkWidget *w = gtk_red_entry_new();
  
  snprintf(str, sizeof(str), _("%.1f°"), val);
  gtk_entry_set_text(GTK_ENTRY(w), str);

  return w;
}

float pos_lat_eval_combo(GtkWidget *widget) {
  char *p = (char*)gtk_combo_box_get_active_text(GTK_COMBO_BOX(widget));
  float val = pos_parse_lat(p);
  mark(widget, !isnan(val));

  return val;
}

static float distance_eval(GtkWidget *widget, math_dialog_state_t *state) {
  char *p = (char*)gtk_entry_get_text(GTK_ENTRY(widget));
  float val = distance_parse(p, state->appdata->imperial);
  mark(widget, !isnan(val));

  return val;
}

float direction_eval(GtkWidget *widget) {
  char *p = (char*)gtk_entry_get_text(GTK_ENTRY(widget));
  float val;
  if(sscanf(p, _("%f°"), &val) != 1)
    val = NAN;

  mark(widget, !isnan(val));

  return val;
}

static void on_calc_clicked(GtkButton *button, gpointer user_data) {
  math_dialog_state_t *state = (math_dialog_state_t*)user_data;
  pos_t pos1, pos2;
  gboolean pos1_ok = FALSE, pos2_ok = FALSE;
  float dist1;
  gboolean dist1_ok = FALSE;
  float dir1;
  gboolean dir1_ok = FALSE;

  /* parse input */
  pos1.lat = lat_get(state->lat1);
  pos1.lon = lon_get(state->lon1);
  if(!isnan(pos1.lat) && !isnan(pos1.lon)) pos1_ok = TRUE;

  pos2.lat = lat_get(state->lat2);
  pos2.lon = lon_get(state->lon2);
  if(!isnan(pos2.lat) && !isnan(pos2.lon)) pos2_ok = TRUE;

  dist1 = distance_eval(state->dist1, state);
  if(!isnan(dist1)) dist1_ok = TRUE;

  dir1 = direction_eval(state->dir1);
  if(!isnan(dir1)) dir1_ok = TRUE;

  /* ------------------- do all calculations ------------------- */


  /* ------------------- distance of coo1 and coo2  ------------------- */
  if(mark(state->distance, pos1_ok && pos2_ok)) {
    char str[32];
    float dist = gpx_pos_get_distance(pos1, pos2, state->appdata->imperial);  
    distance_str(str, sizeof(str), dist, state->appdata->imperial);

    gtk_label_set_text(GTK_LABEL(state->distance), str);
  } else
    gtk_label_set_text(GTK_LABEL(state->distance), STR_NAN);

  // N 53° 09.033'  W 001° 50.666' 100km / 30° = N 53° 55.616, W001° 04.850
  /* ------------------- coordinate projection ---------------- */
  mark(state->proj_lat, pos1_ok && dist1_ok && dir1_ok);
  if(mark(state->proj_lon, pos1_ok && dist1_ok && dir1_ok)) {
    pos_t pro;

    /* get great circle radius in miles/kilometers */
    float gcrad = state->appdata->imperial?3959.0:6371.0;

    // from: http://www.movable-type.co.uk/scripts/latlong.html
    pro.lat = asin(sin(pos1.lat/180*M_PI) * cos(dist1/gcrad) + 
                   cos(pos1.lat/180*M_PI) * sin(dist1/gcrad) * 
                   cos(dir1/180*M_PI) )/M_PI*180;
    pro.lon = pos1.lon + atan2(sin(dir1/180*M_PI)*sin(dist1/gcrad)*
                               cos(pos1.lat/180*M_PI), 
                               cos(dist1/gcrad)-sin(pos1.lat/180*M_PI)*
                               sin(pro.lat/180*M_PI))/M_PI*180;
    pro.lon = fmodf(pro.lon+180,360) - 180;  // normalise to -180...+180

    char str[16];
    pos_lat_str(str, sizeof(str), pro.lat);
    gtk_label_set_text(GTK_LABEL(state->proj_lat), str);
    pos_lon_str(str, sizeof(str), pro.lon);
    gtk_label_set_text(GTK_LABEL(state->proj_lon), str);

    if(!isnan(pro.lat) && !isnan(pro.lon)) 
      state->appdata->geomath = pro;
  } else {
    gtk_label_set_text(GTK_LABEL(state->proj_lat), STR_NAN);
    gtk_label_set_text(GTK_LABEL(state->proj_lon), STR_NAN);
  }

#if 0
  /* ------------ middle between both points ------------- */
  mark(state->middle_lat, pos1_ok && pos2_ok);
  if(mark(state->middle_lon, pos1_ok && pos2_ok)) {
    pos_t res;

    float dlon = fabs(pos2.lon - pos1.lon)/180*M_PI;

    /* http://mathforum.org/library/drmath/view/51822.html */
    res.lon = 180/M_PI * atan(cos(pos2.lat/180*M_PI)*sin(pos2.lon/180*M_PI)/
     (cos(pos1.lat/180*M_PI)+cos(pos2.lat/180*M_PI)*cos(pos2.lon/180*M_PI)));
    res.lat = 180/M_PI * atan((sin(pos1.lat/180*M_PI)+sin(pos2.lat/180*M_PI))/
        sqrt(pow(cos(pos2.lat/180*M_PI)+cos(pos2.lat/180*M_PI)*cos(dlon),2)+
        pow(cos(pos2.lat/180*M_PI)*sin(dlon),2)));

    char str1[32], str2[32];
    pos_lat_str(str1,sizeof(str1),res.lat);
    pos_lon_str(str2,sizeof(str2),res.lon);
    printf("pos = %s/%s\n", str1, str2);
  } else {
    gtk_label_set_text(GTK_LABEL(state->middle_lat), STR_NAN);
    gtk_label_set_text(GTK_LABEL(state->middle_lon), STR_NAN);
  }
#endif
}

void geomath_dialog(appdata_t *appdata) {
  static pos_t pos1 = { 0.0, 0.0 }, pos2 = { 0.0, 0.0 };
  static float dist1 = 0.0;
  static float dir1 = 0.0;
  static gboolean is_imperial = FALSE;

  math_dialog_state_t state;

  /* this is quite ugly. It would be nice to run the entire system on */
  /* one specific system (e.g. metric) and only convert for in- and output */
  if(!appdata->imperial && is_imperial)
    dist1 *= 6371.0/3959.0;   /* we just switched to metric */
  if(appdata->imperial && !is_imperial)
    dist1 *= 3959.0/6371.0;   /* we just switched to imperial */
  is_imperial = appdata->imperial;

  state.appdata = appdata;

#ifdef USE_MAEMO
  if(appdata->cur_cache) 
    printf("current cache is %s\n", appdata->cur_cache->id);
  else
    printf("no current cache\n");
#endif

  GtkWidget *dialog = gtk_dialog_new_with_buttons(_("Geomath"),
                          GTK_WINDOW(appdata->window),
                          //      GTK_DIALOG_NO_SEPARATOR | 
                          GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
                          GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE,
                          NULL);

#if defined(USE_MAEMO) && defined(HILDON_HELP)
  hildon_help_dialog_help_enable(GTK_DIALOG(dialog), HELP_ID_GEOMATH, 
                                 appdata->osso_context);
#endif

  gtk_window_set_default_size(GTK_WINDOW(dialog), DIALOG_WIDTH, DIALOG_HEIGHT);

  /* do geomath dialog */
  GtkWidget *hbox = gtk_hbox_new(FALSE, 0);

  /* ------------------------- input area ------------------------- */
  GtkWidget *table = gtk_table_new(5, 5, FALSE);
  gtk_table_set_col_spacing(GTK_TABLE(table), 2, 20);

  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Latitude:")),              0, 1, 1, 2);
  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Longitude:")),             0, 1, 2, 3);

  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Coordinate 1")),           1, 3, 0, 1);
  gtk_table_attach_defaults(GTK_TABLE(table), state.lat1 = lat_entry_new(pos1.lat),        1, 2, 1, 2);
  gtk_table_attach_defaults(GTK_TABLE(table), state.lon1 = lon_entry_new(pos1.lon),        1, 2, 2, 3);
  gtk_table_attach_defaults(GTK_TABLE(table), coo_popup(appdata, state.lat1, state.lon1),  2, 3, 1, 2);

  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Coordinate 2")),           3, 5, 0, 1);
  gtk_table_attach_defaults(GTK_TABLE(table), state.lat2 = lat_entry_new(pos2.lat),        3, 4, 1, 2);
  gtk_table_attach_defaults(GTK_TABLE(table), state.lon2 = lon_entry_new(pos2.lon),        3, 4, 2, 3);
  gtk_table_attach_defaults(GTK_TABLE(table), coo_popup(appdata, state.lat2, state.lon2),  4, 5, 1, 2);

  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Distance:")),              0, 1, 3, 4);
  gtk_table_attach_defaults(GTK_TABLE(table), state.dist1 = dist_entry_new(dist1, appdata->imperial), 1, 3, 3, 4);

  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Direction:")),             0, 1, 4, 5);
  gtk_table_attach_defaults(GTK_TABLE(table), state.dir1 = gtk_dir_entry_new(dir1),        1, 3, 4, 5);

  gtk_box_pack_start(GTK_BOX(hbox), table, TRUE, TRUE, 0);

  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, TRUE, TRUE, 0);

  /* ------------------------- do-it-button ------------------------- */

  GtkWidget *button = gtk_button_new_with_label(_("Calculate!"));
  g_signal_connect(button, "clicked", (GCallback)on_calc_clicked, &state);

#if defined(USE_MAEMO) && (MAEMO_VERSION_MAJOR == 5)
  hildon_gtk_widget_set_theme_size(button, 
                   (HILDON_SIZE_FINGER_HEIGHT | HILDON_SIZE_AUTO_WIDTH));
  gtk_table_attach(GTK_TABLE(table), button, 3,5,3,5, GTK_EXPAND, GTK_EXPAND, 0, 0);
#else
  /* in non-maemo5 the button has its own row */
  hbox = gtk_hbox_new(FALSE, 0);
  gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, FALSE, 0);
  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, TRUE, FALSE, 0);
#endif  

  /* ------------------------- output area ------------------------- */
  
  table = gtk_table_new(3, 3, FALSE);

  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Distance = ")),
                            0, 1, 0, 1);
  gtk_table_attach_defaults(GTK_TABLE(table), state.distance = gtk_red_label_new(STR_NAN),
                            1, 3, 0, 1);

  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Projection = ")),
                            0, 1, 1, 2);
  gtk_table_attach_defaults(GTK_TABLE(table), state.proj_lat = gtk_red_label_new(STR_NAN),
                            1, 2, 1, 2);
  gtk_table_attach_defaults(GTK_TABLE(table), state.proj_lon = gtk_red_label_new(STR_NAN),
                            2, 3, 1, 2);
#if 0
  gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Middle = ")),
                            0, 1, 2, 3);
  gtk_table_attach_defaults(GTK_TABLE(table), state.middle_lat = gtk_red_label_new(STR_NAN),
                            1, 2, 2, 3);
  gtk_table_attach_defaults(GTK_TABLE(table), state.middle_lon = gtk_red_label_new(STR_NAN),
                            2, 3, 2, 3);
#endif

  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), table, TRUE, TRUE, 0);
  

  gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_CLOSE);

  gtk_widget_show_all(dialog);
  gtk_dialog_run(GTK_DIALOG(dialog));

  /* copy values back to local static variables so they re-appear if */
  /* the dialog is re-opened, convert illegal values (NAN) to 0 */

  pos1.lat = lat_get(state.lat1); if(isnan(pos1.lat)) pos1.lat=0; 
  pos1.lon = lon_get(state.lon1); if(isnan(pos1.lon)) pos1.lon=0; 
  pos2.lat = lat_get(state.lat2); if(isnan(pos2.lat)) pos2.lat=0; 
  pos2.lon = lon_get(state.lon2); if(isnan(pos2.lon)) pos2.lon=0; 
  dist1 = distance_eval(state.dist1, &state); if(isnan(dist1)) dist1=0; 
  dir1 = direction_eval(state.dir1); if(isnan(dir1)) dir1=0; 

  gtk_widget_destroy(dialog);
}
1	/*
2	* Copyright (C) 2008 Till Harbaum <till@harbaum.org>.
3	*
4	* This file is part of GPXView.
5	*
6	* GPXView is free software: you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation, either version 3 of the License, or
9	* (at your option) any later version.
10	*
11	* GPXView is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with GPXView. If not, see <http://www.gnu.org/licenses/>.
18	*/
19
20	#include "gpxview.h"
21	#include <math.h>
22
23	#if defined(USE_MAEMO) && (MAEMO_VERSION_MAJOR >= 5)
24	#include <hildon/hildon-entry.h>
25	#endif
26
27	#define STR_NAN "----"
28
29	typedef struct {
30	appdata_t *appdata;
31
32	GtkWidget lon1, lat1, dist1, dir1;
33	GtkWidget lon2, lat2;
34
35	GtkWidget distance, proj_lat, *proj_lon;
36	GtkWidget middle_lat, middle_lon;
37	} math_dialog_state_t;
38
39	static gboolean mark(GtkWidget *widget, gboolean valid) {
40	gtk_widget_set_state(widget, valid?GTK_STATE_NORMAL:TAG_STATE);
41	return valid;
42	}
43
44	/* a entry that is colored red when being "active" */
45	static GtkWidget *gtk_red_entry_new(void) {
46	GdkColor color;
47	GtkWidget *widget = entry_new();
48	gdk_color_parse("#ff0000", &color);
49	gtk_widget_modify_text(widget, TAG_STATE, &color);
50	return widget;
51	}
52
53	/* a label that is colored red when being "active" */
54	static GtkWidget gtk_red_label_new(char str) {
55	GdkColor color;
56	GtkWidget *widget = left_label_new(str);
57	gdk_color_parse("#ff0000", &color);
58	gtk_widget_modify_fg(widget, TAG_STATE, &color);
59	return widget;
60	}
61
62	static GtkWidget *gtk_dir_entry_new(float val) {
63	char str[16];
64	GtkWidget *w = gtk_red_entry_new();
65
66	snprintf(str, sizeof(str), _("%.1f°"), val);
67	gtk_entry_set_text(GTK_ENTRY(w), str);
68
69	return w;
70	}
71
72	float pos_lat_eval_combo(GtkWidget *widget) {
73	char p = (char)gtk_combo_box_get_active_text(GTK_COMBO_BOX(widget));
74	float val = pos_parse_lat(p);
75	mark(widget, !isnan(val));
76
77	return val;
78	}
79
80	static float distance_eval(GtkWidget widget, math_dialog_state_t state) {
81	char p = (char)gtk_entry_get_text(GTK_ENTRY(widget));
82	float val = distance_parse(p, state->appdata->imperial);
83	mark(widget, !isnan(val));
84
85	return val;
86	}
87
88	float direction_eval(GtkWidget *widget) {
89	char p = (char)gtk_entry_get_text(GTK_ENTRY(widget));
90	float val;
91	if(sscanf(p, _("%f°"), &val) != 1)
92	val = NAN;
93
94	mark(widget, !isnan(val));
95
96	return val;
97	}
98
99	static void on_calc_clicked(GtkButton *button, gpointer user_data) {
100	math_dialog_state_t state = (math_dialog_state_t)user_data;
101	pos_t pos1, pos2;
102	gboolean pos1_ok = FALSE, pos2_ok = FALSE;
103	float dist1;
104	gboolean dist1_ok = FALSE;
105	float dir1;
106	gboolean dir1_ok = FALSE;
107
108	/* parse input */
109	pos1.lat = lat_get(state->lat1);
110	pos1.lon = lon_get(state->lon1);
111	if(!isnan(pos1.lat) && !isnan(pos1.lon)) pos1_ok = TRUE;
112
113	pos2.lat = lat_get(state->lat2);
114	pos2.lon = lon_get(state->lon2);
115	if(!isnan(pos2.lat) && !isnan(pos2.lon)) pos2_ok = TRUE;
116
117	dist1 = distance_eval(state->dist1, state);
118	if(!isnan(dist1)) dist1_ok = TRUE;
119
120	dir1 = direction_eval(state->dir1);
121	if(!isnan(dir1)) dir1_ok = TRUE;
122
123	/* ------------------- do all calculations ------------------- */
124
125
126	/* ------------------- distance of coo1 and coo2 ------------------- */
127	if(mark(state->distance, pos1_ok && pos2_ok)) {
128	char str[32];
129	float dist = gpx_pos_get_distance(pos1, pos2, state->appdata->imperial);
130	distance_str(str, sizeof(str), dist, state->appdata->imperial);
131
132	gtk_label_set_text(GTK_LABEL(state->distance), str);
133	} else
134	gtk_label_set_text(GTK_LABEL(state->distance), STR_NAN);
135
136	// N 53° 09.033' W 001° 50.666' 100km / 30° = N 53° 55.616, W001° 04.850
137	/* ------------------- coordinate projection ---------------- */
138	mark(state->proj_lat, pos1_ok && dist1_ok && dir1_ok);
139	if(mark(state->proj_lon, pos1_ok && dist1_ok && dir1_ok)) {
140	pos_t pro;
141
142	/* get great circle radius in miles/kilometers */
143	float gcrad = state->appdata->imperial?3959.0:6371.0;
144
145	// from: http://www.movable-type.co.uk/scripts/latlong.html
146	pro.lat = asin(sin(pos1.lat/180M_PI) cos(dist1/gcrad) +
147	cos(pos1.lat/180M_PI) sin(dist1/gcrad) *
148	cos(dir1/180M_PI) )/M_PI180;
149	pro.lon = pos1.lon + atan2(sin(dir1/180M_PI)sin(dist1/gcrad)*
150	cos(pos1.lat/180*M_PI),
151	cos(dist1/gcrad)-sin(pos1.lat/180M_PI)
152	sin(pro.lat/180M_PI))/M_PI180;
153	pro.lon = fmodf(pro.lon+180,360) - 180; // normalise to -180...+180
154
155	char str[16];
156	pos_lat_str(str, sizeof(str), pro.lat);
157	gtk_label_set_text(GTK_LABEL(state->proj_lat), str);
158	pos_lon_str(str, sizeof(str), pro.lon);
159	gtk_label_set_text(GTK_LABEL(state->proj_lon), str);
160
161	if(!isnan(pro.lat) && !isnan(pro.lon))
162	state->appdata->geomath = pro;
163	} else {
164	gtk_label_set_text(GTK_LABEL(state->proj_lat), STR_NAN);
165	gtk_label_set_text(GTK_LABEL(state->proj_lon), STR_NAN);
166	}
167
168	#if 0
169	/* ------------ middle between both points ------------- */
170	mark(state->middle_lat, pos1_ok && pos2_ok);
171	if(mark(state->middle_lon, pos1_ok && pos2_ok)) {
172	pos_t res;
173
174	float dlon = fabs(pos2.lon - pos1.lon)/180*M_PI;
175
176	/* http://mathforum.org/library/drmath/view/51822.html */
177	res.lon = 180/M_PI * atan(cos(pos2.lat/180M_PI)sin(pos2.lon/180*M_PI)/
178	(cos(pos1.lat/180M_PI)+cos(pos2.lat/180M_PI)cos(pos2.lon/180M_PI)));
179	res.lat = 180/M_PI * atan((sin(pos1.lat/180M_PI)+sin(pos2.lat/180M_PI))/
180	sqrt(pow(cos(pos2.lat/180M_PI)+cos(pos2.lat/180M_PI)*cos(dlon),2)+
181	pow(cos(pos2.lat/180M_PI)sin(dlon),2)));
182
183	char str1[32], str2[32];
184	pos_lat_str(str1,sizeof(str1),res.lat);
185	pos_lon_str(str2,sizeof(str2),res.lon);
186	printf("pos = %s/%s\n", str1, str2);
187	} else {
188	gtk_label_set_text(GTK_LABEL(state->middle_lat), STR_NAN);
189	gtk_label_set_text(GTK_LABEL(state->middle_lon), STR_NAN);
190	}
191	#endif
192	}
193
194	void geomath_dialog(appdata_t *appdata) {
195	static pos_t pos1 = { 0.0, 0.0 }, pos2 = { 0.0, 0.0 };
196	static float dist1 = 0.0;
197	static float dir1 = 0.0;
198	static gboolean is_imperial = FALSE;
199
200	math_dialog_state_t state;
201
202	/* this is quite ugly. It would be nice to run the entire system on */
203	/* one specific system (e.g. metric) and only convert for in- and output */
204	if(!appdata->imperial && is_imperial)
205	dist1 = 6371.0/3959.0; / we just switched to metric */
206	if(appdata->imperial && !is_imperial)
207	dist1 = 3959.0/6371.0; / we just switched to imperial */
208	is_imperial = appdata->imperial;
209
210	state.appdata = appdata;
211
212	#ifdef USE_MAEMO
213	if(appdata->cur_cache)
214	printf("current cache is %s\n", appdata->cur_cache->id);
215	else
216	printf("no current cache\n");
217	#endif
218
219	GtkWidget *dialog = gtk_dialog_new_with_buttons(_("Geomath"),
220	GTK_WINDOW(appdata->window),
221	// GTK_DIALOG_NO_SEPARATOR \|
222	GTK_DIALOG_MODAL \| GTK_DIALOG_DESTROY_WITH_PARENT,
223	GTK_STOCK_CLOSE, GTK_RESPONSE_CLOSE,
224	NULL);
225
226	#if defined(USE_MAEMO) && defined(HILDON_HELP)
227	hildon_help_dialog_help_enable(GTK_DIALOG(dialog), HELP_ID_GEOMATH,
228	appdata->osso_context);
229	#endif
230
231	gtk_window_set_default_size(GTK_WINDOW(dialog), DIALOG_WIDTH, DIALOG_HEIGHT);
232
233	/* do geomath dialog */
234	GtkWidget *hbox = gtk_hbox_new(FALSE, 0);
235
236	/* ------------------------- input area ------------------------- */
237	GtkWidget *table = gtk_table_new(5, 5, FALSE);
238	gtk_table_set_col_spacing(GTK_TABLE(table), 2, 20);
239
240	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Latitude:")), 0, 1, 1, 2);
241	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Longitude:")), 0, 1, 2, 3);
242
243	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Coordinate 1")), 1, 3, 0, 1);
244	gtk_table_attach_defaults(GTK_TABLE(table), state.lat1 = lat_entry_new(pos1.lat), 1, 2, 1, 2);
245	gtk_table_attach_defaults(GTK_TABLE(table), state.lon1 = lon_entry_new(pos1.lon), 1, 2, 2, 3);
246	gtk_table_attach_defaults(GTK_TABLE(table), coo_popup(appdata, state.lat1, state.lon1), 2, 3, 1, 2);
247
248	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Coordinate 2")), 3, 5, 0, 1);
249	gtk_table_attach_defaults(GTK_TABLE(table), state.lat2 = lat_entry_new(pos2.lat), 3, 4, 1, 2);
250	gtk_table_attach_defaults(GTK_TABLE(table), state.lon2 = lon_entry_new(pos2.lon), 3, 4, 2, 3);
251	gtk_table_attach_defaults(GTK_TABLE(table), coo_popup(appdata, state.lat2, state.lon2), 4, 5, 1, 2);
252
253	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Distance:")), 0, 1, 3, 4);
254	gtk_table_attach_defaults(GTK_TABLE(table), state.dist1 = dist_entry_new(dist1, appdata->imperial), 1, 3, 3, 4);
255
256	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Direction:")), 0, 1, 4, 5);
257	gtk_table_attach_defaults(GTK_TABLE(table), state.dir1 = gtk_dir_entry_new(dir1), 1, 3, 4, 5);
258
259	gtk_box_pack_start(GTK_BOX(hbox), table, TRUE, TRUE, 0);
260
261	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, TRUE, TRUE, 0);
262
263	/* ------------------------- do-it-button ------------------------- */
264
265	GtkWidget *button = gtk_button_new_with_label(_("Calculate!"));
266	g_signal_connect(button, "clicked", (GCallback)on_calc_clicked, &state);
267
268	#if defined(USE_MAEMO) && (MAEMO_VERSION_MAJOR == 5)
269	hildon_gtk_widget_set_theme_size(button,
270	(HILDON_SIZE_FINGER_HEIGHT \| HILDON_SIZE_AUTO_WIDTH));
271	gtk_table_attach(GTK_TABLE(table), button, 3,5,3,5, GTK_EXPAND, GTK_EXPAND, 0, 0);
272	#else
273	/* in non-maemo5 the button has its own row */
274	hbox = gtk_hbox_new(FALSE, 0);
275	gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, FALSE, 0);
276	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, TRUE, FALSE, 0);
277	#endif
278
279	/* ------------------------- output area ------------------------- */
280
281	table = gtk_table_new(3, 3, FALSE);
282
283	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Distance = ")),
284	0, 1, 0, 1);
285	gtk_table_attach_defaults(GTK_TABLE(table), state.distance = gtk_red_label_new(STR_NAN),
286	1, 3, 0, 1);
287
288	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Projection = ")),
289	0, 1, 1, 2);
290	gtk_table_attach_defaults(GTK_TABLE(table), state.proj_lat = gtk_red_label_new(STR_NAN),
291	1, 2, 1, 2);
292	gtk_table_attach_defaults(GTK_TABLE(table), state.proj_lon = gtk_red_label_new(STR_NAN),
293	2, 3, 1, 2);
294	#if 0
295	gtk_table_attach_defaults(GTK_TABLE(table), left_label_new(_("Middle = ")),
296	0, 1, 2, 3);
297	gtk_table_attach_defaults(GTK_TABLE(table), state.middle_lat = gtk_red_label_new(STR_NAN),
298	1, 2, 2, 3);
299	gtk_table_attach_defaults(GTK_TABLE(table), state.middle_lon = gtk_red_label_new(STR_NAN),
300	2, 3, 2, 3);
301	#endif
302
303	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), table, TRUE, TRUE, 0);
304
305
306	gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_CLOSE);
307
308	gtk_widget_show_all(dialog);
309	gtk_dialog_run(GTK_DIALOG(dialog));
310
311	/* copy values back to local static variables so they re-appear if */
312	/* the dialog is re-opened, convert illegal values (NAN) to 0 */
313
314	pos1.lat = lat_get(state.lat1); if(isnan(pos1.lat)) pos1.lat=0;
315	pos1.lon = lon_get(state.lon1); if(isnan(pos1.lon)) pos1.lon=0;
316	pos2.lat = lat_get(state.lat2); if(isnan(pos2.lat)) pos2.lat=0;
317	pos2.lon = lon_get(state.lon2); if(isnan(pos2.lon)) pos2.lon=0;
318	dist1 = distance_eval(state.dist1, &state); if(isnan(dist1)) dist1=0;
319	dir1 = direction_eval(state.dir1); if(isnan(dir1)) dir1=0;
320
321	gtk_widget_destroy(dialog);
322	}